HELP: I just updated my dad's iphone 3G with the 4.2.1 OS AND ALL THE CONTACTS AND MESSAGES ARE GONE

Guys, is there anyone that can help? Doesn't iTunes conduct  backup of the iPhone's contents before syncing? I can't even find the back up file, and I can't locate any extractor! I'm using Windows Vista, and even importing the sim cards contacts comes up with rubbish! Can updating the iphone's software actually erase the contents of a sim card? PLEASE HELP! It will be very very much appreciated!

if iphone is still connected than try this:
right click on the name of the iphone in itunes (right side of the itunes software, under the point devices), than you have a option "restore from back up"
if you disconnected the iphone, than make this before connect the iphone:
open itunes, go to settings, than the point devices and disable automatically sync
just for info:
Where backups are stored
The folder where your backup data is stored changes depending on the computer's operating system. Since iTunes only keeps one backup per device, you should ensure the backup folder is included in your periodic data backup routine.
iTunes places the backup files in the following places:
Mac: ~/Library/Application Support/MobileSync/Backup/
Windows XP: \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
Windows Vista and Windows 7: \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
Note: If you do not see the AppData or Application Data folders, you may need to show hidden files (Windows XP,  Windows Vista and Windows 7), or iTunes may not be installed in the default location. Show hidden files and then search the hard drive for the Backup directory.
http://support.apple.com/kb/HT1766?viewlocale=en_US

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